rdfs:comment
| - Determining if your engine is worn out can be quite difficult, especially if you are new to the hobby. Common symptoms are that the engine will start and run for a bit, and stall, refusing to restart until the engine is cold again. This is because of the tapered design of the ABC sleeve in most engines. It will get enough compression to run when cold, but when it warms up and expands, the piston can't seal properly with the sleeve. The engine may also get impossible to tune, constantly overheating even when rich. This can all be frustrating and confusing to people who are new to the hobby.
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abstract
| - Determining if your engine is worn out can be quite difficult, especially if you are new to the hobby. Common symptoms are that the engine will start and run for a bit, and stall, refusing to restart until the engine is cold again. This is because of the tapered design of the ABC sleeve in most engines. It will get enough compression to run when cold, but when it warms up and expands, the piston can't seal properly with the sleeve. The engine may also get impossible to tune, constantly overheating even when rich. This can all be frustrating and confusing to people who are new to the hobby. While these symptoms are a good sign the engine is worn out, there are other causes of these problems, including air leaks and bad head gaskets. If you have a local hobby shop, you can probably take the engine there and have them do a compression test. Or you can buy a compression gauge and do it yourself. If the compression is low, or a compression gauge is not available, the only way to continue is to tear the engine down, and examine the parts for wear. There are only 3 moving parts in the engine, other then the bearings. At this point, you should read Rebuilding a nitro engine
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